The Humble Weekly Sale this week is for titles from Spiderweb software.
Pay any price (minimum $1 for Steam keys) for the Geneforge Saga, Avadon: The Black Fortress, Avernum: The Great Trials Trilogy, Avernum: First Trilogy, plus Spiderweb game art and hint books.
Get Avernum: Escape from the Pit and Nethergate: Resurrection by paying more than the average.
All games are available DRM-free on Windows and Mac. Limited games are available on Steam and/or DRM-free for Linux.